1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.util;
24  
25  import com.liferay.portal.kernel.util.CharPool;
26  import com.liferay.portal.kernel.util.StringPool;
27  
28  import com.sun.syndication.feed.synd.SyndContent;
29  import com.sun.syndication.feed.synd.SyndEntry;
30  import com.sun.syndication.feed.synd.SyndFeed;
31  import com.sun.syndication.io.FeedException;
32  import com.sun.syndication.io.SyndFeedOutput;
33  
34  import java.util.List;
35  
36  import org.jdom.IllegalDataException;
37  
38  /**
39   * <a href="RSSUtil.java.html"><b><i>View Source</i></b></a>
40   *
41   * @author Brian Wing Shun Chan
42   */
43  public class RSSUtil {
44  
45      public static final String RSS = "rss";
46  
47      public static final double[] RSS_VERSIONS = new double[] {
48          0.9, 0.91, 0.93, 0.94, 1.0, 2.0
49      };
50  
51      public static final String ATOM = "atom";
52  
53      public static final double[] ATOM_VERSIONS = new double[] {0.3, 1.0};
54  
55      public static final String DEFAULT_TYPE = ATOM;
56  
57      public static final double DEFAULT_VERSION = 1.0;
58  
59      public static final String DEFAULT_ENTRY_TYPE = "html";
60  
61      public static final String DEFAULT_FEED_TYPE = getFeedType(
62          DEFAULT_TYPE, DEFAULT_VERSION);
63  
64      public static final String DISPLAY_STYLE_ABSTRACT = "abstract";
65  
66      public static final String DISPLAY_STYLE_FULL_CONTENT = "full-content";
67  
68      public static final String DISPLAY_STYLE_TITLE = "title";
69  
70      public static String export(SyndFeed feed) throws FeedException {
71          feed.setEncoding(StringPool.UTF8);
72  
73          SyndFeedOutput output = new SyndFeedOutput();
74  
75          try {
76              return output.outputString(feed);
77          }
78          catch (IllegalDataException ide) {
79  
80              // LEP-4450
81  
82              _regexpStrip(feed);
83  
84              return output.outputString(feed);
85          }
86      }
87  
88      public static String getFeedType(String type, double version) {
89          return type + StringPool.UNDERLINE + version;
90      }
91  
92      private static void _regexpStrip(SyndFeed feed) {
93          feed.setTitle(_regexpStrip(feed.getTitle()));
94          feed.setDescription(_regexpStrip(feed.getDescription()));
95  
96          List<SyndEntry> entries = feed.getEntries();
97  
98          for (SyndEntry entry : entries) {
99              entry.setTitle(_regexpStrip(entry.getTitle()));
100 
101             SyndContent content = entry.getDescription();
102 
103             content.setValue(_regexpStrip(content.getValue()));
104         }
105     }
106 
107     private static String _regexpStrip(String text) {
108         text = Normalizer.normalizeToAscii(text);
109 
110         char[] array = text.toCharArray();
111 
112         for (int i = 0; i < array.length; i++) {
113             String s = String.valueOf(array[i]);
114 
115             if (!s.matches(_REGEXP_STRIP)) {
116                 array[i] = CharPool.SPACE;
117             }
118         }
119 
120         return new String(array);
121     }
122 
123     private static final String _REGEXP_STRIP = "[\\d\\w]";
124 
125 }